ARM: omap2plus_defconfig: Fix missing video

When the panel-dpi driver was removed, the simple-panels driver
was never enabled, so anyone who used the panel-dpi driver lost
video, and those who used it inconjunction with simple-panels
would have to manually enable CONFIG_DRM_PANEL_SIMPLE.

This patch makes CONFIG_DRM_PANEL_SIMPLE a module in the same
way the deprecated panel-dpi was.

Fixes: 8bf4b162 ("drm/omap: Remove panel-dpi driver")
Signed-off-by: Adam Ford <aford173@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/configs/omap2plus_defconfig

@@ -363,6 +363,7 @@ CONFIG_DRM_OMAP_PANEL_TPO_TD028TTEC1=m
 CONFIG_DRM_OMAP_PANEL_TPO_TD043MTEA1=m
 CONFIG_DRM_OMAP_PANEL_NEC_NL8048HL11=m
 CONFIG_DRM_TILCDC=m
+CONFIG_DRM_PANEL_SIMPLE=m
 CONFIG_FB=y
 CONFIG_FIRMWARE_EDID=y
 CONFIG_FB_MODE_HELPERS=y